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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-04-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000808013</issuerCik>
        <issuerName>NORTH AMERICAN TECHNOLOGIES GROUP INC /TX/</issuerName>
        <issuerTradingSymbol>NATK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001318540</rptOwnerCik>
            <rptOwnerName>Herakles Investments, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5949 SHERRY LANE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1900</rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75225</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 $.001 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2009-04-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>234844</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1152745</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On July 24, 2007, Herakles Investments, Inc entered into a Securities Purchase Agreement (&quot;July 2007 SPA&quot;) by and among North American Technologies, Inc. (&quot;NATK&quot;) and other investors pursuant to which NATK issued to Herakles an 8% Convertible Debenture in the original principal amount of $1,761,330 (&quot;July 2007 Debenture&quot;).  The July 2007 Debenture allows NATK to make quarterly interest payments to holders by issuing shares of NATK common stock, $.001 par value (&quot;Common Stock&quot;).  Pursuant to the July 2007 SPA, first quarter interest in the amount of $35,226.61 was converted at the lower of the volume weighted average price (&quot;VWAP&quot;)or the Conversion Rate (as defined in the July 2007 SPA).  The VWAP of $.15 resulted in the issuance of 234,844 shares of Common Stock.</footnote>
        <footnote id="F2">The amount set forth above reflects a corrected number of total shares held by Herakles Investments, Inc.  The previous calculations mistakenly showed 595 fewer shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Heather Kreager, Senior Vice President, General Counsel and Secretary</signatureName>
        <signatureDate>2009-04-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
