The Predators announced the deal Tuesday.
Salomaki, who turns 23 on March 9, will earn $575,000 in 2016-17 and $650,000 in 2017-18. He has seven points (four goals, three assists) in 45 games this season and has played in 46 career games with the Predators since making his NHL debut Jan. 8, 2015.
The 5-foot-11, 208-pound left wing spent most of the past two seasons in the American Hockey League with the Milwaukee Admirals scoring 70 points in 117 games. The native of Raahe, Finland, was the 52nd draft selection overall in the 2011 draft.