I don't know if there is anything available for the Sprint View card, but some wireless broadband cards can be connected directly to a router which then provides Internet access to devices that are attached to the router. If you can find a router that is compatible with the Sprint card, you can give access to the XBOX that way.
I would be very surprised if the card could be connected directly to the XBOX since the card requires specific software and drivers in order to function and you might have a hard time getting those installed on your XBOX...