Reinhart has represented Canada at five International Ice Hockey Federation (IIHF) sanctioned events, two at the under-18 level, two at the world junior level, and one at the IIHF Men's World Championship. He won gold in 2016, gold in 2015 and bronze in 2012 at the under-18 level. Additionally, Reinhart represented Canada Pacific at the 2012 World U-17 Hockey Challenge and Canada at the 2012 Ivan Hlinka Memorial Tournament.