Occupational Therapy can help in a lot of areas. Not only anything to do with sensory issues, but also if there are problems with loose joints causing pain or affecting handwriting. My eldest daughter is an Occupational Therapist (OT), actually chose the profession because she grew up with our family and saw the sort of problems that her practical mind could work on, in other people.
I really don't know how much it could help with your child, because there could be issues that even YOU don't fully realise. Once an Occupational Therapist (OT) begins to assess your child, sometimes some unexpected things can come out. If there is a need to refer to a different speciality, they will do this. For example, sometimes Sensory Integration Disorder (SID) can account for food faddishness, or possibly there could be a genuinely underlying physical problem to do with swallowing, and this becomes a speech therapy issue/ A lot of people don't realise that speech therapists also can help with swallowing problems, although within speech therapy the swallowing experts are a subset, often. But if the issue is purely sensory - it's still coming under Occupational Therapist (OT).
If you feel your child has Sensory Integration Disorder (SID) issues, even if it's not formally diagnosed, then an Occupational Therapist (OT) is worth a visit. But while you're there, check out all possibilities. Any report can also be put into the centre of the room when other specialists check out your child, and it all gets considered in making a diagnosis.
Marg