IPSEC VPN config with SD WAN recommendations

[SCMSACIT]

Hello Below is a diagram of my current network and i am about to get second internet connections at both my main sites and i am looking for some advise on how to config my VPN's to fully use both internet connections. 

[Viknesh_Muniyandi]

If I'm right, then you are looking to load balance the traffic between main site to the branch office using 2 ISP's. 

Please refer this link below,

https://kb.fortinet.com/kb/documentLink.do?externalID=FD41297

I'f I misunderstood the issue, please correct me!

[SCMSACIT]

Yes i am but the link only talks about doing it between 2 sites but i want to do it between multiple sites