Use this simple sieve to separate your worms from the compost. 
 
Size: 50 cm x 65 cm
Mesh aperture: 5mm
Varnished wood frame

How to use
Simple place the seive on a wheelbarrow or any inclined surface
Empty your compost on top in small quantities
Shake the sieve in the direction of incline
The worms and undecomposed material will fall off the bottom
The vermicompost will go through the sieve to be collected
Small worms and cocoons might slip through the mesh so keep your vermicompost moist while you are storing it