Recycling Wood From Furniture

I had an old couch that, over the years completely wore out, and I got rid of the cushions, springs, and cloth coverings.

I have been wondering if the wood frame of the couch could be used for some shelving I want to do in my shack.

The wood seems in places to be rough and splintery, and obviously I do not want to be handling splintery wood.

Could this type of wood be smoothed off with sanding, to rid it of splinters, or is such a thing impossible with this type of wood?