Hello Amer,
Yes the scenario you are trying is possible.
1. For Internet traffic and remote access vpn originating from inside your network to outside
route outside 0 0
pointing towards ISP 1.
2. Whereas for all the site 2 site vpn you would require to put static route for remote peer and remote internal network through DMZ interface
for eg :
route DMZ a.a.a.a 255.255.255.255 ( where a.a.a.a is remote peer)
route DMZ x.x.x.x mask < next hop > ( where x.x.x.x is remote internal network required to be accessed)
Note : for all the remote access vpn terminating on your firewallto access internal network use
route DMZ y.y.y.y mask ( where y.y.y.y is the ip pool of the remote access vpn)
Regards
Kumar Gaurav