Sforza represented Argentina at U15 and U17 level; as captain of both. He was a part of the squad that won the 2017 South American U-15 Championship on home soil, as he netted goals against invitees Czech Republic and, in the semi-finals, Peru. After appearing for the U17s in a friendly with the United States in 2018, the midfielder was selected by Pablo Aimar in 2019 for the South American U-17 Championship in Peru and FIFA U-17 World Cup in Brazil. He scored once, versus Uruguay, in eight appearances at the former as they won the trophy, before featuring four times at latter as they reached the round of sixteen.