Not sure what you mean by "disable". If the subscription has expired, it will no longer receive programming and only the preview channel will work.
If you mean you want it so that it flat out doesn't work anymore, I am not sure what you could do aside from having the XM antenna disconnected from the rear of the head unit. It will still come up as an option on the display with a screen message such as "Signal Lost" or something like that.
If you mean you want to end the subscription you currently have, you would call XM and ask for them to cancel your subscription.
The satellite radio is integrated into the Sonata's head unit, therefore it will always be there. It isn't something that can be permanently removed.
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