In 2016, Wegnez reached the final of the 2016 Junior World Cup and he was part of the Belgian selection that placed for the final at the 2017 European Championship in Amsterdam. In November 2018, he was selected for the 2018 World Cup, which they eventually won by defeating the Netherlands in the final. At the 2019 EuroHockey Championship, where Belgium won its first European title, he was named the player of the tournament. In December 2019, he 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.