Luypaert became European champions with the Belgium U21 squad in 2012. He was selected for the 2012 Summer Olympics but was eventually omitted in the final selection. Luypaert became European vice-champion with Belgium at the 2013 European Championship on home ground in Boom, Belgium. He was a part of the Belgian squad that won the 2018 World Cup. In August 2019, he was selected in the Belgium squad for the 2019 EuroHockey Championship. They won Belgium its first European title by defeating Spain 5-0 in the final. On 25 May 2021, he was selected in the squad for the 2021 EuroHockey Championship.