You could try an plastic bottle trap. Bait it with some shrimp then weight it down near the entrance to his burrow. Maybe he'll go in and you can yank the bottle out before he escapes.
The way I removed mine was to find out which rock it would hide in and remove it to the sump.If it is not alot trouble removeing the rock.My shrimp would not come out in the open for the bottle trick.It now lives in my sump