Sure, and very easily!
If you started creating an app for your team before multiple-admins was created, you can move it from your My Yapps dashboard into whichever team is should be a part of.
Find the app you'd like to transfer and click the gear icon in the upper right corner of the app's card. From the drop-down list, click 'Move Yapp'. Select the team you want to move it to in the pop-up modal and ta-da! Your app is now in your Team dashboard.
If you've already invited members to your Team, they'll now have access to this app.