The new manager is getting his squad ready as they near a return to pre-season training.
The Huish Park boss and towering defender Wilkinson, 28, link up again after working together at Stevenage.
Sarll said: “I’m delighted to be reacquainted with Luke - a player and person I know very well.
“He brings defensive qualities, experience and a physicality I feel we were lacking.
“Even better, Luke is a Somerset lad and he and his family want to return ‘home’ and live in this part of the world.
“He’s bought into being part of this football club and will be a great addition to the squad.”