Editors/Proof Readers
Because proofreading requires concentration, you'll probably be alone in a quiet room somewhere, most of the time.
Writers
Because you can write anywhere, you're not really restricted to being in any place with anyone.
Programmers
If technology is your thing, consider being a software developer. Developers sometimes meet to discuss design and progress, otherwise, they will be coding alone most of the time.
Maintenance Jobs
Not all maintenance is done in a team. Plumbers and electricians can complete most tasks alone.
Freelancer
Accept projects from remote locations. Payment and delivery is done online, you never need to leave your home. Example: Freelance Programmer, Freelance Graphic Designer, Freelance Writer etc.
CCTV Surveillance Officer
Not a high paying job but at least you will be alone. Look at a bunch of TV screens for unusual activity. Simple, easy and isolated!
Graphic Designer
You'll still have to meet with others to understand the requirements, but most of the time you'll be working on the designs yourself.
Lab Technician
There is no customer contact here, but there is some limited interaction with fellow associates. Anyway, you'll be working on samples most of the time, so there shouldn't be any tissue (disturbing issues).
Medical Transcriptional
Typical introvert job. The medical transcriptional needs to be in a quiet room so that they can transcribe properly.
Painter
Painters usually work as part of maintenance teams but the painting work itself can be completed individually.
Carpenter
You will need some space to craft those wonderful wooden creations.
Librarian
Working with books all day in a completely silent room.