I see no indication on the AT&T Sportsnet website that they have support for streaming devices, only for access via mobile devices and web browsers. They have an app for Android devices on the Google Play site, and I'd assume the Apple app store as well.
So you may be able to get this on a computer or mobile device then cast or mirror it to your Roku.
You must be in one of the three regions served by AT&T Sportsnet, have a tv provider subscription with a system that provides you with AT&T Sportsnet, and that tv provider must have agreed to let AT&T stream its content to the tv provider's customers.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
