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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-03-11</periodOfReport>

    <issuer>
        <issuerCik>0001314727</issuerCik>
        <issuerName>Sonos Inc</issuerName>
        <issuerTradingSymbol>SONO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001184231</rptOwnerCik>
            <rptOwnerName>GENACHOWSKI JULIUS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SONOS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>614 CHAPALA ST.</rptOwnerStreet2>
            <rptOwnerCity>SANTA BARBARA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-03-11</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10656</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>86119</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents the number of shares subject to restricted stock units (&quot;RSUs&quot;) that were granted on March 11, 2024.</footnote>
        <footnote id="F2">The RSUs will vest in full upon the earlier of March 11, 2025 or the next annual meeting of stockholders, subject to the continuing service of the Reporting Person on the vesting date.  Vested shares will be delivered to the Reporting Person on January 1, 2028.</footnote>
        <footnote id="F3">Each RSU represents a contingent right to receive 1 share of the Issuer's Common Stock upon vesting and settlement for no consideration.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Rebecca Schuster by power of attorney</signatureName>
        <signatureDate>2024-03-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
