Despite returning from injury, it's unlikely that Sandin draws into the Leafs lineup, at least for now. He hasn't played since March 19th and with Jake Muzzin being back from injury and playing well there isn't really a need for Sandin in the Leafs lineup. Especially when he did not look good in a short stint playing on the right side.
Either way, this is good news for Sandin and the Leafs and it's makes the Leafs defensive core even deeper, knowing that Sandin is healthy and waiting to get in.