One Active Network Card at a time

I have end users with laptops that have both the wired nic and wireless nic available to them. I would like to be able to use an application that would allow them to be able to use only one nic at a time. When they come into the office they plug into the lan with their wired connection, and as there is wireless in the building from another company I don't want to the end users to be able to connect to both networks. This would cause a security breach as we have locked down our network and now the laptop is bridging the two networks together. I don't want to disable the wireless NIC in the BIOS settings as the laptops are on used on the road and need to be able to connect to the internet through wireless or wired connection in order to check back in with the office. Any help would be greatly appreciated. Thank-YOU