Crews were called out to the vacant pro shop around 6:00 a.m. to the 1700 block of Glassboro Road in Sewell.
The country club shares the same building as the former Ron Jaworski's Eagles Nest.
Flames were brought under control about an hour and a half after firefighters arrived at 7:42 a.m.
The cause of fire was ruled arson by the Gloucester County Fire Marshal's Office.
The arson fire is currently under investigation by the Gloucester County and Deptford Township officials.
No injuries were reported.