Are you using the Dev.exe (found in your main sins installation folder)? When you use it what error message do you get before the game crashes? If you can't decipher it by yourself post it here. Most of the time you can easily find mistakes/typos from reading these error messages.
Until then, or if the Dev.exe doesn't return anything useful, I suggest you rename your edited module file (just add a "2" to the filename), and make your race use the standard file to see if you have other problems. Then copy the unchanged file to your mod folder and use that one, giving it the exact same name as your modded file had.
If either of these crash your game, your problem isn't (only) in the module file.
If that doesn't crash the game, try changing values on the file you copied and check every time. Once the game crashes, you know which value is causing problems.
But really, try the Dev.exe first.
