Sengstock would also win an NBL championship in 1980, again with St. Kilda. That year he was also named to the Australian Olympic team for the first time and played for the Boomers in 1980 Summer Olympics in Moscow, Russia. He also represented Australia at the 1984 Summer Olympics in Los Angeles (USA), 1988 (Seoul, South Korea) and 1992 in Barcelona, Spain, and at four FIBA World Championship tournaments (1978, 1982, 1986 and 1990).