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 opportunities to compete at the representative level against other 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 including ISA Representative Teams, NSW CIS, NSW All Schools and School Sport Australia.

ISA Athletics

The College holds its annual inter house Athletics Carnival, from which students are selected to represent the College at the various CAS and GPS invitational carnivals.  These lead up carnivals form final selections for the annual ISA Carnival.

ISA Basketball

The College enters teams from 13 years to Opens age groups in the ISA Basketball Division 1 competition.  These games are held on Saturdays during terms 4 and 1.  The ISA selects representative teams from all ISA schools in the Opens age group only that play against other associations in NSW.

ISA Cross Country

The College holds its annual Cross Country championships, from which students are selected to represent the College at the annual ISA Carnival.

ISA Rugby Union

The College enters teams from 13 years to opens age groups in the ISA Rugby Division 1 competition.  These games are held on Saturdays during terms 2 and 3.  The ISA selects three representative teams from all ISA schools in the 16 years, 1st XV and 2nd XV ages that play at the NSW Schoolboys Tournament.