Coombs was part of the Australia men's national wheelchair basketball team at the 1960 Rome, 1968 Tel Aviv, 1972 Heidelberg, 1980 Arnhem and 1984 New York/Stoke Mandeville Paralympics [REF].
He captained the silver-medal-winning Australian wheelchair basketball team at the 1974 Commonwealth Paraplegic Games in Dunedin, led the Australian team in gold medal performances at the 1977 and 1982 FESPIC Games, captained the team at the 1977 Silver Jubilee Games, and played in the 1983 Wheelchair Basketball World Championship [REF].