You can get leg traps from a hunting store (Get the ones that have no teeth because otherwise it'll be illegal). Try to find out if they frequent certain areas. Once you know where they go, boil some water in a large drum or burn barrel and throw in some heavy flavor wood (hickory, maple, or other similar wood), and wait for the wood to get all through the water, after a bit tie some strings on the traps and toss them in the water and let them boil for a couple hours. After that the sent of them will be mostly gone and covered with the tree sent. Throw some paraffin wax in the pot and let it melt. Pull the traps slowly out by the string so that they get covered with the paraffin and that will help keep sent off them. Set the up and let them sit for a day or 2 then set and bait them.
Check the traps evening and mornings. Because they have no teeth it shouldn't harm animals too much and you'll be able to see what you catch. If you got a 'yote, a .22lr hollow point or magnum will take quick care of it and not leave a chance of traveling through.
I've ad to do something like this but traps don't stay in the sugar sand here. Used to work with Department of Environmental Protection and they suggested the traps to me. They used the same when studying them and removing pest 'yotes.