Hello,
You can pass VPN traffic from your laptop to the LAN behind the PIX, if your VPN client has a tunnel to the router and the router also has a tunnel to the PIX.
What you need to do is include in the rules for interesting traffic the other network.
In other words,
In the L2L tunnel between the router and the PIX, you should include the VPN client subnet.
In the remote access VPN between the VPN client and the router, you should include the PIX's LAN.
Federico.