Forcing Sudden Death on server side

[gottimw]

Its TF2 related

So i had a problem with a sudden death mode not working, a stalemate poped out at the end of round. I did some research and found out that it Sudden death (SD) to be set one the server side too.

Is there a way to force the server to switch frome stalemate to SD ?
I know the console command but is there a way to enforce that command on map spawn?