Van Doren became European champions with the Belgium under-21 squad in 2012. His first selection for the national team was at the age of 17. With Belgium, he became European vice-champion at the 2013 European Championship on home ground in Boom and at the 2017 European Championship in Amstelveen, Netherlands. He was a part of the Belgian squad which won the silver medal at the 2016 Summer Olympics. In 2016, he won the FIH Rising Star of the Year award, which he won again in 2017 together with the FIH Player of the Year award. He was a part of the Belgian squad which won Belgium its first World Cup and European title. In December 2019, he again was nominated for the FIH Player of the Year Award. On 25 May 2021, he was selected in the squad for the 2021 EuroHockey Championship.