<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-07-23</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001370314</issuerCik>
        <issuerName>Double-Take Software, Inc.</issuerName>
        <issuerTradingSymbol>DBTK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001382849</rptOwnerCik>
            <rptOwnerName>Jones Daniel M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>257 TURNPIKE ROAD, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SOUTHBOROUGH</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01772</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP of Sales and Marketing</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2693</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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            <ownershipNature>
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            <transactionDate>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>10.55</value>
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                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
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            <securityTitle>
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            <transactionTimeliness>
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                <transactionPricePerShare>
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            <expirationDate>
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                <underlyingSecurityTitle>
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        <derivativeTransaction>
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            <transactionDate>
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            <transactionTimeliness>
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            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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            </underlyingSecurity>
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            <ownershipNature>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option ? right to Buy</value>
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            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-07-23</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1649</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.03</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2015-01-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option ? right to Buy</value>
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            <conversionOrExercisePrice>
                <value>1.52</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-07-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>116265</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.03</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F4"/>
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            <expirationDate>
                <value>2015-02-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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            <ownershipNature>
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        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option ? right to Buy</value>
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            <conversionOrExercisePrice>
                <value>1.96</value>
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            <transactionDate>
                <value>2010-07-23</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8163</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.59</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-04-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8163</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option ? right to Buy</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-07-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12780</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.52</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-02-16</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12780</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option ? right to Buy</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.46</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-07-23</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>10750</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.09</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F7"/>
            </exerciseDate>
            <expirationDate>
                <value>2020-02-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10750</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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                    <value>D</value>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of the Issuer's common stock originally granted on January 28, 2010, subject to the satisfaction of certain performance criteria during fiscal year 2010. Pursuant to the Issuer's Amended and Restated 2006 Omnibus Incentive Plan and the merger agreement, dated May 17, 2010, between the Issuer, Vision Solutions, Inc. and HA Merger Sub, Inc., upon the consummation of the merger, the restricted stock units were cancelled and converted into the right to receive the per share merger consideration of $10.55 per share. The merger was consummated on July 23, 2010.</footnote>
        <footnote id="F2">Cancelled, extinguished and converted into the right to receive merger consideration of $10.55 per share pursuant to the merger agreement between the Issuer, Vision Solutions, Inc. and HA Merger Sub, Inc.</footnote>
        <footnote id="F3">This option was cancelled in the merger in exchange for a cash payment of $9.61 per share, which represents the difference between the exercise price of the option and the consideration payable in the merger for shares of the Issuer's common stock ($10.55 per share).</footnote>
        <footnote id="F4">This option was cancelled in the merger in exchange for a cash payment of $9.03 per share, which represents the difference between the exercise price of the option and the consideration payable in the merger for shares of the Issuer's common stock ($10.55 per share).</footnote>
        <footnote id="F5">This option was cancelled in the merger in exchange for a cash payment of $8.59 per share, which represents the difference between the exercise price of the option and the consideration payable in the merger for shares of the Issuer's common stock ($10.55 per share).</footnote>
        <footnote id="F6">This option was cancelled in the merger in exchange for a cash payment of $3.52 per share, which represents the difference between the exercise price of the option and the consideration payable in the merger for shares of the Issuer's common stock ($10.55 per share).</footnote>
        <footnote id="F7">This option was cancelled in the merger in exchange for a cash payment of $2.09 per share, which represents the difference between the exercise price of the option and the consideration payable in the merger for shares of the Issuer's common stock ($10.55 per share).</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Tushar Hefa, attorney-in-fact</signatureName>
        <signatureDate>2010-07-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
