It happened on Saturday at midnight in the Bedford-Stuyvesant section.
The 20-year-old woman was walking near Madison Street and Patchen Avenue, when the suspect approached her from behind, dragged her into Reinaldo Salgado Park, threw her to the ground, punched her repeatedly and stole approximately $60 from her.
The suspect then pushed the victim against a fence and sexually assaulted her before leaving.
The victim was taken to a local hospital in stable condition.
The suspect is described as 5'9", medium build, with light hazel eyes, and a medium skin tone. He was last seen wearing blue sweat pants and a dark hooded sweatshirt.
Anyone with information in regard to this incident is asked to call Crime Stoppers at 1-800-577-TIPS (8477).