Oleksuk had 19 goals and 21 assists in 74 games last season with Worcester of the AHL.
The Sharks also announced Friday that former forward Niklas Sundstrom has been hired as a European scout and several other changes to the front office.
Mike Ricci will work on the development of the team's forwards throughout the organization and Bryan Marchment will have a similar role for defencemen. Scout Dirk Graham will also work in the player development process with an emphasis on leadership and character development.
I definitely think going back down helped me, I had a lot of confidence down there, I played a lot of minutes and I think that helped me a lot. With the 37 games up here, that gave me experience as well. I know what it takes to play in the NHL and now it's time for me to show that I'm capable of being a full-time NHL player.
— Oilers forward Leon Draisaitl on finishing the 2014-15 season in juniors after playing 37 games with Edmonton to begin the season