Boske moved to Newcastle at the age of 18 to work as a professional rugby player at the Newcastle Falcons. Earlier in the Netherlands he played at the Rugby Club Hilversum, where he played with Scottish international Tim Visser, among others. After three years he got injured during the County Cup Final and stopped playing rugby temporarily. Back in the Netherlands, he resumed his career at the Rugby Club Hilversum two years later, winning the Dutch title five times.