Yes there is a way to get standalone BTN2GO, it's BTN International for those who travel to or live in other countries and dont want to miss a game, you have to use a VPN in the US however. VPN service will likely cost you around $5 a month, maybe even less for very basic features, it also protects you from being hacked or being spied on by your provider so nice bonuses. Yearly BTN cost is about $10 a month if pay for the full year, more information below.
BTN international page, if you click on it with a US ip it will say it's not available in your country.
https://international.btn2go.com
Here is the FAQ from their page
What programming is available on BTN2Go International?
BTN2Go International features the same content and programming as BTN2Go. Subscribers to BTN2Go International have access to a 24/7 feed of the network, live streaming of all BTN games, on-demand access to archived games carried by partner networks (ABC, ESPN and CBS), hundreds of hours of original programming including
The Journey,
Big Ten Icons,
Big Ten's Best and
The Big Ten's Greatest Games, as well as game highlights and coaches' shows.
How do I get BTN2Go International?
BTN2Go International is available on a subscription-basis, with Annual ($119.95), Monthly ($19.95) or 24-Hour ($14.95) subscriptions from which to choose.