Yes, sometimes NDIS does fund horse riding or equine therapy. Costs of equine therapy may be covered by NDIS if:
This form of treatment is likely to have a positive impact on your health and wellbeing and;
It is directly related to your disability. It also needs to meet the reasonable and necessary test that NDIS applies to all purchases made using plan funds.
There are a number of organisations you can contact to find out more. Here are a few to get you started:
Riding For The Disabled https://www.rda.org.au/
Eq Cetera: https://www.eqcetera.org/
There are some great horse stories on the NDIS website.
Here's one to get you started: https://www.ndis.gov.au/stories/3812-daisy-riding-high-meeting-her-idol
There are a couple of examples of goals here: https://www.leapin.com.au/news/riding-for-the-disabled-how-can-it-help/