yes, but the first tool (PS3 Save Unlocker) didn't work with all games.
corwin75 made a new one recently : PARAM Edit
I don't know if it works with more/all games.
French version 1.1, 1.2 (link to 1.2 didn't work for me, it loaded my own account).
English translated version 1.1 translated by TizzyT
You'll need to create a new save with your new account.
It will merge the old account's save data into the save you want to use (the one from your new account).
I didn't try it yet.
Here the developer's message:
It’s complicated you change your ps3 saves by lack of knowledge or you have simply no hex editor? The solution is very simple. PARAM Edit is a small program that I just create to modify your saves in several areas:
- Modify the protection of saves (lock / unlock copies)
- Make compatibility saves with your account
- Modify the saves details
- Change the title of the saves
- Edit sub-title of the saves
Sources are being modified to be especially easy to read and understand each operation.
For compatibility. You need a save to make it compatible with a game and a save from your account with the same game.