Yes, there absolutely is. When you go to launch/publish your Siminar, you'll see a link you can copy, as well as short links you can share on Facebook, twitter, etc.
Also - if you like, with premium plan you can set up a subdomain of your own domain. For example, you can set up courses.example.com and all your Siminars in that plan will appear there - so basically it will appear like they are still on your site. All you need to do is set up the subdomain with your hosting provider, then go to our plan manager and add it to the tab that says Custom URLs.