When I go into System->Project Roles I can "Manage Deafult Members" for the given roles.
To the one of the roles I would like to add new group (as default member), but when I do it, this group is not added to the projects, which are already created.
Is there any solution to solve it? Or do I have to add this group to each existing project separetly?
No, the defaults only apply at the time of creating a new project, they're not retrospective because you really don't want them to be - imagine a secured project for sensitive information being opened up to everyone just because you change a default.
You will, as you suspect, need to amend each project
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