Well, if your child has poor fine motor skills, then anything that they can do which uses fine motor skills will help. Prime examples would include legos, k'nex, play doh, modeling clay, drawing, etc.
But overall, I would caution you not to worry too much about it. So long as your child is capable of walking around and feeding himself, then you really don't need to worry that much about motor coordination. There is no reason that your child absolutely has to be well coordinated, and trying to force it is usually results in spending a lot of time and effort to accomplish little to nothing for very little benefit.
So, yeah, get him some coloring books, legos, or something like that and let him have some fun, but don't freak out about the fact that your child is uncoordinated and make a big deal out of it. That doesn't do anybody any good.