Active play is one way to help children with sensory integration problems. Set up a series of activity stations that engage the senses, then have your students take turns playing at each one. A small trampoline, a tunnel for your students to crawl through and a table full of sand or water for them to dip their fingers in are all good ideas.
Students with sensory integration problems may struggle with the sensation of sticky, wet or cold on their fingers. Make these textures fun, and give the student a chance to approach them as a game, and they'll learn to tolerate the sensations. Handling commercial or homemade clay or goop made from corn starch and water encourages students to get dirty and slimy and learn to handle the sensation.
For older students who have sensory issues that affect their handwriting, a club where they can get together and work as a group might help. For some students, the act of holding a pencil correctly or the feel of their hands being held in the proper position is difficult. Students can get together during part of their lunch time or before or after school and practice the skills necessary for handwriting. Allow them to write with fun or unusual items, such as sidewalk chalk or scented markers.
For young students who struggle with the sensation of different textures, making a game out of experiencing those textures might help. Send your students on a scavenger hunt to find something soft, scratchy, sticky and smooth. They will have to touch the objects to judge their texture. Ask students to describe what a texture feels like and let them take their time exploring it once they find something that fits the bill.