Koepke, who was eligible to become a restricted free agent this summer, inked a one-year, two-way contract with Tampa Bay on Wednesday.
Koepke posted one goal in 17 games with the Lightning in 2022-23. He also contributed seven goals and 19 points in 52 contests with AHL Syracuse. The 25-year-old will likely start the 2023-24 campaign in the minors, but he might be summoned by the big club during the season as an injury replacement.