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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-11-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001347523</issuerCik>
        <issuerName>Landmark Apartment Trust, Inc.</issuerName>
        <issuerTradingSymbol>NONE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001627184</rptOwnerCik>
            <rptOwnerName>SALKIND GEORG GERSHON</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ELECTRA TOWER 50TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>98 YIGAL ALON STREET</rptOwnerStreet2>
            <rptOwnerCity>TEL AVIV</rptOwnerCity>
            <rptOwnerState>L3</rptOwnerState>
            <rptOwnerZipCode>67891</rptOwnerZipCode>
            <rptOwnerStateDescription>ISRAEL</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001627231</rptOwnerCik>
            <rptOwnerName>G. SALKIND LTD.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ELECTRA TOWER 50TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>98 YIGAL ALON STREET</rptOwnerStreet2>
            <rptOwnerCity>TEL AVIV</rptOwnerCity>
            <rptOwnerState>L3</rptOwnerState>
            <rptOwnerZipCode>67891</rptOwnerZipCode>
            <rptOwnerStateDescription>ISRAEL</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001626123</rptOwnerCik>
            <rptOwnerName>ELCO Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ELECTRA TOWER 50TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>98 YIGAL ALON STREET</rptOwnerStreet2>
            <rptOwnerCity>TEL AVIV</rptOwnerCity>
            <rptOwnerState>L3</rptOwnerState>
            <rptOwnerZipCode>67891</rptOwnerZipCode>
            <rptOwnerStateDescription>ISRAEL</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001626110</rptOwnerCik>
            <rptOwnerName>ELCO NORTH AMERICA INC.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ELECTRA TOWER 50TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>98 YIGAL ALON STREET</rptOwnerStreet2>
            <rptOwnerCity>TEL AVIV</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>67891</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-11-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>340000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7511834.734</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Elco North America Inc.</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Operating Partnership Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2015-11-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>340000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>340000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12309860259</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Elco North America  Inc.</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Issuer issued 340,000 shares of its common stock to Elco North America Inc. (&quot;ENA&quot;) in order to redeem an equivalent number of ENA's OP Units (as defined below) in response to a notice of redemption delivered by ENA to the Issuer pursuant to the Partnership Agreement (as defined below) of Landmark Apartment Trust Holdings, LP (the &quot;Operating Partnership&quot;).</footnote>
        <footnote id="F2">The operating partnership units (&quot;OP Units&quot;) represent units of limited partnership interests in the Operating Partnership. The OP Units have the rights and preferences as set forth in the Agreement of Limited Partnership of the Operating Partnership, as amended (the &quot;Partnership Agreement&quot;), and do, following a 12-month holding period, become redeemable, subject to certain limitations, in exchange for either (i) shares of common stock of the issuer on a one-for-one basis or (ii) a cash amount equal to the product of (A) the number of redeemed OP Units, multiplied by (B) the &quot;cash amount&quot; (as defined in the Partnership Agreement), provided, however, if the common stock of the issuer has not become listed or admitted to trading on any national securities exchange at the time of the redemption, the cash amount, notwithstanding anything to the contrary, shall be $8.15 per redeemed OP Unit.</footnote>
        <footnote id="F3">These 7,511,834.734 shares of Common Stock of the Issuer are held by ENA, of which Elco Limited is the sole shareholder.  Approximately 64.9% of Elco Limited is held by G. Salkind Ltd., an Israeli corporation, of which Georg Gershon Salkind is the sole shareholder.  The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interests therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.</footnote>
        <footnote id="F4">The OP Units do not have an expiration date.</footnote>
        <footnote id="F5">These 12,309,860,259 OP Units are held by ENA, of which Elco Limited is the sole shareholder.  Approximately 64.9% of Elco Limited is held by G. Salkind Ltd., an Israeli corporation, of which Georg Gershon Salkind is the sole shareholder.  The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interests therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Eliezer Vessely, Attorney-in-Fact</signatureName>
        <signatureDate>2015-12-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
