MacOS – Generic TWAIN driver for OS x

First thing to check is : Do your modem support Mac OS X ?

If the documentation said so, you should try to connect the modem directly on your Mac and see what happens.

In case nothing works, I'd say that this modem is for PC only and you'll not find any driver for Mac OS X. The only way to make it works is to boot on your BootCamp partition and install the driver on it, but you'll can use only Windows and not Mac OS X.

Edit : I'm not sure that virtualization solve the problem too. Most of the time, the Internet connection is shared on the VM from host to guest. I think you can't share connection from guest to host.

Hamrick VueScan

This is a "Swiss-Army-knife" scanning application that supports hundreds and hundreds of makes and models of scanners, even many obsolete ones which don't have direct Mac OS X support.

Download and evaluate the trial version.

I use it with my Brother MFC-6490CW, which does have Mac OS X drivers, but I'd rather use VueScan than use the Brother or Apple scanning software. Although VueScan has TWAIN support, I use it as a stand-alone scanning solution to output PDF, TIFF and JPEG.