You would have to run the network you use for your PS4 through a VPN so it looks like your in another country. This should unblock gambling inside the casino.
If you have a laptop, you could buy a decent VPN then run your PS4 network through that but your probably best upgrading to a VPN modem.
This will run all your network traffic through the VPN so no messing around turning your laptop on to connect to it. They can be pricey but definitely worth the investment.