converting my shop to 220v
Sure. 


Pull four appropriately sized conductors from the main panel, to the new shop panel. 
Install a properly sized double pole breaker in the main panel, and connect the four conductors properly in the main panel.
Connect the four conductors properly in the shop panel, making sure the neutral bar is isolated from ground.
Install a grounding electrode system (if the shop is detached from the main building).
Bond the shop panel to the grounding electrode system.