If you use Suunto Sports Watches you can use them with Sports Tracker via Movescount*.
You need to connect your Movescount account with to your Sports Tracker account. After this all your workouts will be synchronised/sent to your Sports Tracker account.
There is no way to connect Suunto Sports Watches directly to Sports Tracker at least for the moment.
*This applies only if the Suunto Sports Watch can communicate with Movescount.