Answer:
If you mean SoBe, or South Beach, the answer is no, provisionally.
Because of the strong European and South American influence the businesses on South Beach have recognized that they must meet wishes of their clientele, so women are free to enjoy the beach without the need for tops. This is mainly from about 20th Street south, but observe the scene when you arrive and use your judgement.
If you want a true nude beach try Haulover Beach 10 miles north. It is constantly becoming more popular with the young hotties from South Beach.