Swimming has been a regular feature at Sacred Heart College since the school's inception. In recent years the Sacred Heart Swimming Sports has been a traditional fixture on the school calendar and contributes heavily to the inter-house school competition. Swimming at school events is predominantly held in Term 1.
From the Sacred Heart Swimming Sports, teams are chosen to represent the College at the Auckland Secondary Schools qualification Eastern Zones. From here, swimmers qualify for Auckland Secondary Schools Championship in both relays and individual events. Occasionally, the school also sends a team to the NISS Championship and the NZSS Championship.
Many of the Sacred Heart swimmers compete for Auckland and national honours through the club system. Sacred Heart supports students swimming for these events. Current students at Sacred Heart are winning medals at both Auckland and national swimming meets.