VPN IP Conflicts

Connecting a PC to one network on a grouping of 10.0.0.x through to a VPN connection to a similar network also running on 10.0.0.x means we cannot establish a connection to a terminal server past the gateway on the remote network since a call to 10.0.0.3 exists on both networks.
Is there a way to specify connect to the remote network first (or exclusively)? Or any other way to connect given that both networks run TCP only, and neither can have their netmask changed.
The client PC is a Windows2000 PC behind an ISA server, connecting via VPN to a remote win2k server, then using the VPN to contact a terminal server.