You can only use sv_cheats on a "Single-player Listen Server".You can do this by opening the console and typing in "map
Note 1:You need the Developer Console Activated [See Quote Below] Quoted from the Valve Development Community Wiki:
The console starts disabled. To enable it, load the game and visit Options > Keyboard > Advanced. Once enabled, it can be opened and closed by pressing the button above the Tab.
(This should work regardless of your keyboard layout. If it doesn't, add -console to the game's launch options and type bind your_key "toggleconsole".)
Note 2:You can "Try" and get people to join using the "connect " command.
Note 3:Do NOT include the <>'s in the "map" and "connect" commands
.sv was created in 1994.
SV Excelsior was created in 1927.
SV Yeşilyurt was created in 1973.
SV Allenstein was created in 1910.
SV Alsenborn was created in 1919.
Buxtehuder SV was created in 1862.
SV Würmla was created in 1969.
SV Elversberg was created in 1907.
SV Gonsenheim was created in 1919.
SV Schaffhausen was created in 1922.
SV Straelen was created in 1919.
SV Muttenz was created in 1921.