Since they are coming in on the VPN which should have it's own zone and the user will be identified through the GP client this is easily done. Just create a policy like @jdprovine suggests and scope it down the the proper and appropriate source zone/user/dest zone/server(s) make sure it is above any policy that may *provide* the access to those servers by that user/etc
I'll play devil's advacate and take the stance that GlobalProtect was configured in a way that the your internal traffic and your VPN traffic aren't seperated (which should be fixed). To accomplish this you would setup split tunneling so that the only traffic that was actually sent through the firewall would be the servers that you want to allow access to, otherwise all other traffic would terminate through the local internet connection.
You can do this by including the address in the 'Includes' list, or by simply excluding servers that you do not want them to access by including the IP address directly in the 'Excludes' list.
You can find information about GP Split Tunnel setup by going to THIS article.
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