童軍服務員
Khoo joined Scouting in 1965 at the age of nine as a Cub Scout and earned his King's Scout award in 1973. He has served as a Rover Scout leader, Scout Leader at the Maz International School, Chairman of the 25th Asia Pacific Region Scout Jamboree in Thailand in 2006, and Assistant National Chief Commissioner of the Scouts Association of Malaysia, as well as various positions in the King Scout's Association of Malaysia.