If you can install the free software Inkscape (http://inkscape.org/) then you can convert your svg to a pdf file (as it can saves as pdf).
You can then use anonline website http://www.pdftodxf.com/ to convert pdf to dxf...
Or alternatively, you can find also free-to-try programs like "Any PDF to DWG Converter" (or others) to do the same thing. After that, autocad can open dxf and save as dwg...
Best of luck!
Access a broad range of knowledge to help get the most out of your products and services.
Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.
Upgrading to a 2015 product? Make sure to check these out 1st!