Yes, but the integrated "Freeview" decoder will play no part in it.
The Freesat decoder will connect to the TV with ideally an HDMI cable or a scart, depending on the interfaces provided on the two units; or in rare cases phono or "S" video and separate audio might be used. All ultimately achieve the same video and audio signal transmission, just some are more convenient and better than others.
Then via the TV's menu you will select the appropriate input when you want to watch satellite TV.