Steyn thus joins fellow South Africans AB de Villiers and Chris Morris in the BBL, with the pair earlier joining Brisbane Heat and Sidney Thunder respectively.
Steyn, who is South Africa's highest wicket taker in Test cricket with 439 scalps, retired from the longest format after a series of injuries that kept him out of action for the better part of the last three years. He remains available for the ODI and T20I series and although he was ready to be part of the team that recently toured India, the selectors decided that he was not medically ready.