Ruiz has been playing for the national team since 2013 when he made his debut in 2013 EuroHockey Championships. He was part of the Spain squad that finished thirteenth at the 2018 World Cup. He scored one goal in three games in that tournament. At the 2019 EuroHockey Championship, he won his first medal with the national team as they finished second. On 25 May 2021, he was selected in the squad for the 2021 EuroHockey Championship.