routing guru

I need a routing guru, I’m not that good a routing. This is my problem:
got a machine conneted via VPN to our network with an IP of 192.168.0.200

I have to subnets connected to my switch,
the following machine can ping my 192.168.0.200 address
IP ###.###.20.144, mask 255.255.255.224, gateway ###.###.20.129

I also have a subnet with ###.###.44.*
this machine cannot see the 192.168.0.200 machine
IP ###.###.44.144, mask 255.255.255.224, gateway ###.###.44.129

How can I add a rounte on the ###.###.44.144 to see the 192.168.0.200 machine?

Thanks in advance