connecting a VPN without connecting PPPoE connection

Hello everybody. In my company, clients connect their pppoe connections to connect to internet. some of them are in the support department and they need to connect a VPN from other companies to solve their problems. when they connect PPPoE connection, they have internet on their PCs. but when they connect VPN, internet stops and they cannot do anything. IS there any way which I can open VPN connection for clients without connecting PPPoE connection?
Thanks for your help

Use a VPN that supports split tunnels.

Sent from my SCH-I545 using Tapatalk 2