I'm not sure if I understand exactly what you are asking, but you can have access to both networks, through a VPN tunnel, but it may require you to define two "connections" in the VPN setup. Same endpoints for both, but different local or remote subnets in each definition. Is that what you are trying to avoid?
i trying to avoid that if i define one connection in the vpn setup, i can have access to both networks (two different local subnets) modifing the filter rules or this isn´t possible?
If you are planning to connect roadwarriors you could select Any as remote network 0.0.0.0/0 - that is a yes If you are planning to interconnect networks you'd need two Security Associations - that is a no.
If you are planning to connect roadwarriors you could select Any as remote network 0.0.0.0/0 - that is a yes If you are planning to interconnect networks you'd need two Security Associations - that is a no.