Šmits competed with Latvia's junior national teams at the 2011 FIBA Europe Under-16 Championship, and at the 2012 FIBA Europe Under-18 Championship and 2013 FIBA Europe Under-18 Championship. He also played with Latvia's junior national team at the 2014 FIBA Europe Under-20 Championship and at the 2015 FIBA Europe Under-20 Championship.