Not sure which version of Mass Effect you are playing is it 1 or 2 ? If it is Mass Effect 2 then it is a relatively simple matter to do what you requested. If you have finished a playthrough using the character with your preferred face then all you need to do is start a "New Game +" and load that character in. At the main menu of ME 2 select new game and then select "import ME2 character" that will import all the characters features and during the beginning of the game you will be given an option to change the "class" of your character.
Alternatively if you created your Shepard face in ME 2 then you should have what is called a "face code". Load a save game with your preferred Shepard and then pause the game and go to the squad screen. At the top left hand corner you should see a face code similar to this :-
541.DDE.DU6.11U.GBS.H6W.CM7.692.1N6.165.E47.6
Write that face code down and when you start a new game in ME 2 and you come to the face creation stage simple delete the existing face code in the lower left hand corner and type the code in from your preferred Shepard (note this will not work if you have an ME 1 imported Shepard or you are using the default Shepard).
If you are talking about ME 1 then your options are rather limited. About the only thing you can do is do a "New Game +" and select your character. I believe it will give you the ability to change the class without changing anything else.
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