There are a variety of prompts to help children learn speech sounds through tactile cues. One method, PROMPT, requires training and certification. I have never had this training.
I have however, developed some of my own visual and tactile cues to teach placement for speech sounds.
Every day I sign and sing the alphabet with my self-contained classes. Recently, I began bringing the signs up to my lips in order to emphasize my mouth movements for each sign.
This is what I’ve developed (movie is only 23 seconds long):
I’m sure it’s not perfect, but at this point it works very well for me. Notice the hand movement for sounds that are longer (such as /s/) and the bounces for multi-syllabic letters (/w/). I lower my hand for the /k/ and /g/ sounds, because these sounds are made in the back of the tongue and touch my lips for the lip sounds (/m/, /p/, /b/, etc.).
Have fun signing and speaking. And don’t be afraid to learn some new things!