On July 29, 2015, Sabonis debuted for the Lithuania men's national team in a game against Australia, scoring 4 points and grabbing 7 rebounds. Sabonis was the youngest player ever to play for the national team, beating Jonas Valančiūnas by a matter of days. Sabonis averaged 6 points and 5.9 rebounds during the preparation games phase, and was the team's second best rebounder after Valančiūnas. Sabonis played for Lithuania at EuroBasket 2015, winning a silver medal in his debut year. He also was a member of the Lithuanian Olympic national team during the 2016 Summer Olympics, where he averaged 5.5 points and 4.5 rebounds.