What plants would be best for shady, sandy area?
The area is under two trees and the soil is not very good. I would love some ferns or ornamental grasses there.
Suggested Project Book
what is your location
Hostas will grow under any conditions. Coral bells also will grow in the shade, but you may have to add some top soil.
http://harris.agrilife.org/files/2011/05/shadegardening.pdf