The Independent Sporting Association (ISA) is a school-based sport association.

Its purpose is to provide inter-school sports competition on a home-and-away basis between the member schools for both genders in Years 7 to 12. The ISA calendar provides an annual sporting programme that offers full and varied opportunities for students and staff. The ISA encourages and promotes citizenship and education through sport with competitions held on Saturdays.

The ISA offers students representative opportunities and at this representative level compete against major school associations in NSW. From these associations, students are selected for the New South Wales Combined Independent Schools (NSWCIS) representative teams to compete against Combined Catholic Colleges (CCC) and Combined High Schools (CHS).

The ISA provides students the opportunity to represent New South Wales and Australia through this and other pathways.