The added beds will also allow the intensive care unit space for another 60 patients.
As Covid case numbers continue to increase state-wide, many public hospital patients will be transferred to private hospitals to make more room for other Covid patients.
According to Health Minister Stephen Wade, the state will need to “adapt” in order to cope with the highly contagious Omicron variant.
"Omicron has changed the game," he said.
"We've got lower severity cases but we've got higher transmissibility, so that means more cases more quickly, which means we need more beds."
The new beds are expected to increase capacity by 100 at all three medical hubs with Flinders Medical Centre able to treat 100 extra patients while still attending to babies and pregnant women.
Stay up-to-date on the latest news with Your Morning Agenda - supported by a network of local journalists from all major Australian cities, ensuing timely and first hand insights on local stories:
Download LiSTNR and enjoy a new world of audio. All your favourite shows and stations in one library.