assuming you are running the latest version of the Sonos app or version 80.xx.xx within the sonos app. There is a gear icon in the upper right hand corner that takes you to ‘System Settings’.

Next to the name of your Sonos system it says ‘Manage’. Under manage is ‘Network’ about ½ way down. Here you can Manage Networks to update your network, remove current network etc.

Sadly that section of my Android app is blank, no network settings available.

App: 80.03.04 release 20240618 -- Updated from the App Store on 21 June

What has been suggested is to set your WiFi to what your Sonos is expecting for the SSID and password.

Or this:

https://support.sonos.com/en-us/article/connect-sonos-to-a-new-router-or-wi-fi-network