Joop Cabout played with the Dutch male waterpolo team during one of its strongest periods. He joined the 1948 Olympic team (bronze) as a reserve, but played in the teams that on the 1949 Trofeo Italia and 1950 European Championships. The Dutch were heavily favored for a medal at the 1952 Olympics, but were eliminated after a controversial match against Yugoslavia. A life-long member of Gouda club GZC, Cabout won the Dutch title in 1954 and 1957. He passed on his love for water polo to his son, Martin, and his grandchildren. Four granddaughters played at a national level, and Mieke, Jantien and Harriët made it into the Dutch national team. At the 2008 Games, Mieke Cabout won a gold medal.