I'm not familiar with it, but if it's a VSTi you can use it in Sonar, however you will need a wrapper (VST to DX).
You can try Fxpansion. I think they have a free one, but the free might not do VSTi's (only VST). Therefore you probably will have to buy the full version.
I just want to report the full version works!
I bought Cubasis 4.0 to test the VG and to get a feel of VST technology. However, I'm so familiar with the cakewalk environment that I find Cubasis hard to use. Now with the new wraper I can play VG as another instrument like LiveSynthPro... So no need to get the full version of Cubase... They might not want to hear that though.