Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

Americans pronounce soy as SOY (/sɔɪ/). You'll hear it in sentences like "She makes scented candles using soy wax and essential oils".
Record yourself saying "soy" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 2 sounds. Explore each sound's mouth shape and how it's made.