If on same ticket JL should tag bag to BNE however you'll still need to collect it in SYD to clear customs then drop it off at the domestic transfer desk prior to catching the QF shuttle bus from T1 (intl) to T3 (domestic). If separate tickets JL and QF are both in the One World alliance so give JL your QF flight details and ask them to tag the bag through to BNE.
If you're caught up in customs QF will transfer you onto a later flight. Don't muck around purchasing duty free on arrival or if you must pre-order ahead so you can just grab it and go.
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