Hello @router_owner,
There is a way, though you need to have a much more complex system to do that, VLAN and Port security is done regualrly on goverment and finanical and large corpeate networks.
We have created a guide here within the Forum on how you can do what you want with the Wi-Fi and lots of people have done this for various reasonons including seperating out IoT devices, cameras, printers and guest devices.
Simply created a VLAN and turn of the intervlan routing. Then create a new SSID and associate it only with that VLAN. You now have an isolated Wi-Fi network.
Happy to Help,
Marcus