N'Doye won a gold medal with France at the 2014 FIBA Europe Under-16 Championship in Latvia, averaging 5.8 points, 3.4 rebounds and 2.3 assists per game. He won another gold medal with France at the 2016 FIBA U18 European Championship in Samsun, Turkey. N'Doye also competed in the 2017 FIBA Under-19 World Cup in Cairo and the 2018 FIBA U20 European Championship in Chemnitz, Germany, but his team failed to medal.