Tomić played with Croatia, at both the junior and senior levels of competition. In 2009, he won the gold medal at the Mediterranean Games in Pescara, Italy, and as a full international, he appeared in numerous competitions in which the senior Croatian national team qualified. He competed at the World Championship in Turkey, in 2010, at the EuroBasket in Lithuania, in 2011, and at the EuroBasket in Slovenia, in 2013. He also played at the 2014 FIBA World Cup, in Spain. After representing Croatia at the EuroBasket 2015, where they were eliminated in the eighth finals by the Czech Republic, he announced his retirement from national team competitions.