Some things I found on a Droid Help Site (but you probably looked there):
– Yeah, there’s really no way to do this. Smartphones are meant to access the internet, that’s what they do. You’d have to completely disable the phone to prevent internet access.
– In theory if you had root access, you could rename the tiwlan_drv.ko to say tiwlan_drv.ko.bak and wifi wouldn’t work at all.
– This might fit the bill, let us know:
Protector Android App Review by AndroidTapp.com | Android Tapp. Android App Reviews
Protector protects any Android application