Android - How to connect to multiple VPN in android

According to https://developer.android.com/reference/android/net/VpnService.html,

There can be only one VPN connection running at the same time. The existing interface is deactivated when a new one is created.

So, no, you can only have one VPN at a time on Android. You can switch between the two, though, when you need to use the other.