Is there anything you can use to help you look for your shoe which you lost in a field?

Depending on what is in the field, (like grass or tall corn...), and whether or not you still need the shoe, you could use a lawn mower (if you don't really need the shoe but just want to find it) or you could use the help of several friends all looking together at the same time and some luck!

I notice it's a shoe instead of shoes you're looking for.
Get a trained dog... have it sniff the other one and seek.