Hi, you can add a function in your site code and checked if the current user is logIn, if so use wixLocaiton.to in order to redirect to another page,
Another advance option is to use router,
https://support.wix.com/en/article/corvid-working-in-the-code-panel
https://www.wix.com/corvid/reference/wix-users.html#currentUser
https://www.wix.com/corvid/reference/wix-location.html#LocationChangeHandler
https://support.wix.com/en/article/corvid-creating-a-router#add-a-router
Best,
Sapir