Yamamoto was placed on waivers by Utah on Friday, Elliotte Friedman of Sportsnet reports.
Yamamoto signed a one-year, two-way contract with Utah on Sunday.
Yamamoto agreed to terms on a professional tryout agreement with Utah HC on Wednesday.
Seattle didn't issue a qualifying offer to Yamamoto on Sunday, per PuckPedia, making the 25-year-old forward an unrestricted free agent.
Yamamoto scored a goal on three shots and added two PIM in Saturday's 3-1 loss to the Stars.
Yamamoto notched an assist and two shots on goal in Tuesday's 5-4 overtime loss to the Golden Knights.
Yamamoto went scoreless in Monday's 3-0 road loss against the Penguins.
Yamamoto recorded an assist in Thursday's 4-1 win over the Senators.
Yamamoto tallied a goal and an assist in Tuesday's 4-0 win over the Panthers.
Yamamoto signed a one-year, $1.5 million contract with Seattle on Sunday.