At the 2012 Summer Olympics, he competed for the national team in the men's tournament. Gougnard became European vice-champion with Belgium at the 2013 European Championship on home ground in Boom. During the 2018 World Cup, he lost his father and in the match on the next day against England, Belgium played with a mourning band. Gougnard scored the 2–0 in that match and eventually they won the tournament by defeating the Netherlands in the final. 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.