Bali International School is an active member of the Bali Schools Sports Association (BSSA), which is a group of international and local schools who are working together to promote and implement friendly sporting competitions among schools in Bali. Interschool competitions currently running are: football (soccer), cross country, volleyball, athletics, swimming and basketball.
Other activities being offered presently at Bali International School are: Tae Kwon Do, tennis, rock/wall climbing, touch rugby, karate, cricket, games club and surfing.
BIS is also a member school of IISSAC (Indonesian International Small Schools Activities Council). This is an opportunity for BIS students to represent BIS and to compete against other schools from around Indonesia.