Surf Life Saving Queensland has warned swimmers to stay away from the sinkhole, which has swallowed part of unpatrolled Jumpinpin beach on North Stradbroke Island.
A spokeswoman said the sinkhole was about 100 metres wide and opened up sometime on Wednesday.
She said the hole was quite a distance away from any patrolled areas and lifeguards were urging people to keep clear of it.
"There are really strong currents in the water and the sand is quite unstable," she told AAP.
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In September a hole swallowed a caravan, car trailer and tents further north at Inskip Point, near Rainbow Beach.
However that event was described as a "near shore landslide event" rather than a true sinkhole.
