pull out, pluck, take hold of
撏 centers on grasping and removing something with the hand: pulling out, plucking, or taking hold of an object.
撏 combines 扌 (hand) with 尋, which likely contributes the sound and may relate to seeking or reaching, suggesting a hand action of pulling or plucking.
The hand radical 扌 beside 尋 looks like a hand reaching to pull something out. Imagine plucking a stubborn weed from the ground.
For サン, picture pulling out a sand-covered object: sand -> サン, and your hand plucks it free.