St Kieran’s Catholic Primary School offers a range of opportunities for students to engage in School Representative Sport. During Term 2, the children in Years 3-6 participate in inter-school sport (Gala Day) with the other Catholic schools in the Peninsula Community of Catholic Schools. The Gala Day is preceded by skills sessions organised by the development officers in such sports as Rugby League, AFL, Soccer and Netball. During the year teams also compete at various one day competitions organised by the sporting bodies such as the Peninsula Community of Catholic Schools & Robbie Slater Cup (soccer), AFL Auskick, Milo Primary Schools Cricket competition and invitational Netball carnivals. 

Summer and Winter trials in a range of sports are conducted each year for students in Years 5 and 6 for selection to represent the Diocese of Broken Bay.  

Talented students between the ages of 8–12 also have the opportunity for selection in Peninsula Cluster and Diocesan Representative Teams for swimming, athletics and cross country.