Is it possible to have multiple mac address in same vlan interface?

Hi,
I want to use multiple ISP PPPOE Clients in the same vlan but ISP doesn’t allow multiple accounts on the same MAC Address so I need a different Mac address on the same VLAN, Is it possible to do so?

You can possibly add a macvlan to the vlan, and then add your new PPPoE client to the macvlan (which has a different mac address).