Hey! Montessori has a lot of different lessons for social and emotional learning! There are several lessons from various Montessori certified teachers. Search for Carrots are Orange Montessori. Thats one that I follow.
One of the SEL lessons I like to use is one on making quiet, utilizing a bell. Its all about making your entire body quiet.
Another one is on the Peace Rose. Its a GREAT lesson on taking turns talking but also how we create peace.