The St. Joseph Academy Wildcats compete in the National Division of the Cape-Atlantic League, an athletic conference comprised of public and private high schools located in Atlantic County, Cape May, Cumberland, and Gloucester counties, that operates under the aegis of the New Jersey State Interscholastic Athletic Association. With 203 students in grades 10-12, the school was classified by the NJSIAA for the 2019–20 school year as Non-Public B for most athletic competition purposes, which included schools with an enrollment of 37 to 366 students in that grade range (equivalent to Group I for public schools). The football team competed in the Independence Division of the 95-team West Jersey Football League superconference and was classified by the NJSIAA as Non-Public Group II for football for 2018–2020.