The school exels in water polo, swimming and biathle. Full colours for water polo is awarded to players who are selected for a Boland u19 team, while swimming full colours are awarded to any athlete qualifying for, and competing at SA Youth or Senior National Championships. Despite their new-found enthusiasm for water polo Paul Roos still has no water polo Springboks, although two swimmers have achieved national colours. In 2012 the school sent a water polo team to tour in Hungary.
Various others have also achieved national colours in sports with an aquatic element - Riaan van Rooyen and Gary Mandy in triathlon, Werner Botha was a double Springbok in biathle and pentathlon, while Gareth Broberg and Shaun Roos achieved colours in biathlon.
Heerden Herman swam the 400 and 1500 freestyle at the 2012 London Olympic Games, after which he completed his studies at Stellenbosch university, where he was awarded a Rhodes Scholarship in 2013. Both swimmers are the product of th University of Stellenbosch Swimming Club, where they swam under coach Pierre de Roubaix.
At the 2017 World Biathle Championships in Spain, PRG trio of Ruard van Renen, Deacon Bradley and Bernhard Andrag represented South Africa, while Josh Sunderland (bottom) came second at the under 15 world championships in 2015.
While swimming remains a sport mainly practised outside the school at local clubs, water polo has has greatly developed at Paul Roos in recent years. The school even sent a team to tour Hungary in 2012! The team was Martin Venter, Jacques Oosthuizen, Paul du Plessis, Lourens van der Walt, Gerhard Olivier, Cornelis Broeksma, Lohann Louw, Walt Haller, Michael Du Toit, Emile Cloete, Dylan Naude, Aldo Laubscher, Jason Ehlers, Vaughn Marlow (coach) and Ben Puddu (manager).
Over the last 2 and a half years Paul Roos Gymansium has developed and introduced various water polo programs at junior schools within the Boland area. This initiative started at Laerskool Eikestad where water polo was introduced as an extra-curricular sport and sessions where facilitated at Paul Roos Gymnasium.
Through word of mouth and interest in the sport by the end of 2015 – Rhenish Primary and Laerskool Stellenbosch had started programs in the same capacity. At the start of 2016 a group from Somerset West, comprising of boys from Beaumont, de Hoop and Somerset House had also joined and formalized league matches became a reality.
League fixtures consisted of teams comprised of seniors, Grade 6 and 7 as well as juniors, Grade 4 and 5. Close to 200 kids were playing water polo in the Boland at a junior school level.