<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-08-01</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000908652</issuerCik><issuerName>LANDRYS  RESTAURANTS INC</issuerName>        <issuerTradingSymbol>Lny</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001080301</rptOwnerCik><rptOwnerName>FERTITTA TILMAN J</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>1510 WEST LOOP SOUTH</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>HOUSTON</rptOwnerCity><rptOwnerState>TX</rptOwnerState><rptOwnerZipCode>77027</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther><officerTitle>CEO and President</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-08-12</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1" /></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>100000</value></transactionShares><transactionPricePerShare><value>19.5</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>4700000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes><footnote id="F1">Restricted stock grant pursuant to employment agreement which vests in full 10 years after date of grant.</footnote></footnotes><remarks></remarks><ownerSignature><signatureName>\Tilman J. Fertitta\</signatureName><signatureDate>2003-08-15</signatureDate></ownerSignature></ownershipDocument>

