The incident happened just after 5:30 p.m. at the Eastern Supermarket on Grand Street.
Authorities say the four suspects entered the store, removed merchandise and attempted to exit without paying.
The 50-year-old victim tried to stop them from shoplifting when he was struck in the face with a skateboard.
He was treated and subsequently released from New York Downtown Hospital.
Anyone with information in regards to this incident is asked to call Crime Stoppers at 1-800-577-TIPS (8477).