Does anyone know an international (English speaking) school near Narbonne that has a Specialist Teaching Facility (STF) offering speech and language support?

Hi, and welcome to the forum!
If permitted, a quick google search found these pages from another forum:
https://www.angloinfo.com/languedoc/...-schooling-456
https://www.angloinfo.com/how-to/fra...eeds-education

Please confirm that you mean speech and language support in mother-tongue English, in which case I can't advise more than consult the above links.
How old is the child concerned and to what extent does he/she need support? If a French school is at all possible, any "foreign" child up to about 9 will generally have time to master French Grammar before going up to Collège, without much language support, but over 9, he/she will need extra tutoring in order to cope with the Collège Curriculum. On the other hand, all pupils needing any type of speech support can consult an "orthophoniste".
I think we need more details so that we can give more help, but Narbonne isn't best placed for international/bilingual schools, with or without STF....