Acoustic simulation is a deficit in first-class CAD packages.
That's probably more of a feature than a bug since they have different purposes and different. That said, there are a variety of acoustics simulation (including auralization) software designed to be used with CAD packages, included EASE/EASERA, CATT Acousics, Bose Modeler, BASTIAN, SONarchitect and so on.
These packages aren't at a point where they can be used by non-acoustics experts which is probably why they aren't integrated directly into CAD software (although I remember reading once about an auralization package for AutoCAD, but I can't find it right now) due to limitations in the algorithms that might be ignored by folks that don't know acoustics.
I wish someone would make a 3D sound simulation plug-in for blender. http://www.blender.org
You could add "speaker" objects that produce sound, just like "lamp" objects currently produce light, and allow a "microphone" object to receive the sound waves. Microphones could be tested in multiple places of the model space.
Useful environment spaces and materials could be provided, such as cathedral, studio room, creeks and outdoors, etc.
Most architect only use 2d drafting software like autocad, microstation and vectorworks where 'simulation' doesn't apply. There is a move to BIM based tools that would potentially be able to offer this dot of facility, however acoustic modelling of retail space is way down on the list of priorities and resultant design are highly likely to fall foul of value engineering.
[0] http://render.otoy.com/gallery.html
[1] http://www.chaosgroup.com/en/2/galleries.html?catID=8&pr...
[2] http://www.gametrailers.com/videos/rsaomx/cryengine-2-cryeng...