Policy Route

Just one question:

Should the method I chose work?

If so, I think the problem is on the other side. And they need to check their configuration

Correct, please inform the team check on the remote site !

Better asked question

Could I have 2 different Subnet in the remote subnet section

Of course, but whatever changes you make locally need to be reflected on the remote site !

as said the other side is a Zyxel
And on The Zyxel it is apparently not possible to define 2 subnets in the same site to site configuration

Alright, so this is the limitation of the remote site. Hence you'll have to continue using one subnet.

Hello everybody

We found a solution for this Site to Site Problem

On the other side we have now 2 sidetoside configuration

On the local side the LAN_Crans Subnet

And for the local side as said befoe i have 2 Remote subnet in my site2site configuration

The connection is OK but I can't ping any device on the other side
But no Problem to ping with the firewall diagnostic ping

Can you perform the packet capture for the ping traffic - https://support.sophos.com/support/s/article/KB-000035761?language=en_US

And validate that the traffic over the IPsec is going from correct rule and IPsec0 interface ?

Thank you for your answer

But no packet receive fronm otherside 172.16.60.100

Firewall log:

And no capture with filter on otherside IP 172.16.60.100

Firewall ping

It looks like it is not detecting the traffic rule, can you create a separate firewall rules:
1.) LAN to VPN 
2.) VPN to LAN
The traffic should go out of the IPsec0 interface !
Route Sophos Firewall-initiated traffic through an IPSec VPN tunnel