I should say that my test machine is running Motion 4 and AE CS5.5. If you're on different versions I won't be able to speak to the success of these tactics.
There are a couple of things to try...
Start a new Motion project and drop the template that you're after into the project. Save this out as a Motion project.
In After Effects, import this Motion project as you would any other media. Drop it into your comp or start a new one based on it's parameters by dropping it on the New Composition icon in the project pane.
Hopefully, you're done and this worked. Works for me. The beauty of this is that you can go back to tweak the Motion project by clicking on it in the Project pane or Timeline and going to Edit > Edit Original (⌘+E) This should relaunch the original Motion project again. Tweak it, resave it and edits should bounce back to AE.
If none of this works for you then you could, of course, make the Motion project and render it out, import the QT movie (or whatever) into AE. But this will flatten the inter-operability. The elegant round-tripping will be no more.
Edit: There *used* to be a page on Apple's site way-back-when that documented this.
http://www.apple.com/pro/techniques/motionaftereffects/
Here it is on the Way Back Machine:
http://web.archive.org/web/20101012041108/http://www.apple.com/pro/techniques/motionaftereffects/