I don't think there is a social worker for people with learning disabilities. Most people with learning disabilties have average to above average intelligence and are capable of making it fairly independently, even if they use coping strategies- if you have a math learning disability, you would simply use a calculator and call it a day!
One of the job possibilities you are talking about is called a 'Vocational Rehabilitation Counselor'. "Rehabilitation counselors help people deal with the personal, social, and vocational effects of disabilities. They counsel people with disabilities resulting from birth defects, illness or disease, accidents, or the stress of daily life. They evaluate the strengths and limitations of individuals, provide personal and vocational counseling, and arrange for medical care, vocational training, and job placement. Rehabilitation counselors interview both individuals with disabilities and their families, evaluate school and medical reports, and confer and plan with physicians, psychologists, occupational therapists, and employers to determine the capabilities and skills of the individual. Conferring with the client, they develop a rehabilitation program that often includes training to help the person develop job skills. Rehabilitation counselors also work toward increasing the client’s capacity to live independently."