static routing should take care of the issue. Instead of using the 0.0.0.0 route pointing into your tunnel, only set up route(s) that are on the other side of the tunnel, to use the tunnel.
it will end up being something like this if you want to keep it simple. Depending on your security stance it can get much more complicated.
This example assumes that your company is using the 192.168.0.0/16 network.
ip route 0.0.0.0 0.0.0.0
ip route 192.168.0.0 255.255.0.0
It's hard to get too much more specific without seeing some configs.