You can buy traps for moles from most hardware stores. Unfortunately or fortunately depending on how you look at it most of them are inhumane.
The best way of using them is to find the mole run, dig down and place the trap into the channel that the mole has dug. Then instead of covering the hole with soil again, lightly place large dock leaves over the open area and just sprinkle a little soil onto the dock leaves to weight them down, preventing them from blowing away. This gives the appearance of the hole still being intact as far as the mole is concerned, making it more likely that he will go into the trap, hopefully!