Yes, one of the ways to set up an IPsec VPN is to create a "dial-up VPN". This is exactly the same as what a (software) VPN client does.
The exact configuration steps depend on the version of FortiOS you're using (v4.3, v5.0, v5.2). If v5.2, you could use the VPN assistant which guides you through the steps necessary (phase1, phase2, policy - no routes). But even doing it manually in the CLI is not difficult. Get the "FortiOS Cookbook" from docs.fortinet.com where you find lots of real world example setups.
Hopefully you have a good reason to try to do it this way. Cisco VPN usually uses a self-configuration mode for VPN clients (modconfig). FortiOS supports this but probably only by enabling it in the CLI.