I would like to restrict a field value modification only for admins.
I did not find any option for that but in that case of there is no possibility is there any chance to create multiple forms for one SharePoint list?
There is no such options out of the box. Sharepoint doesn't have an field level security option.
What you can do:
The answer below in the link is from 2017 but may still apply - No out of the box feature, but look into 3rd party