Couldn't find my list, so I googled it. Apparently there are a variety of reasons people cut. Here are alternatives based on your reason for cutting. There's also a self-injury section on PC.

If you cut to express pain and intense emotions

• Paint, draw, or scribble on a big piece of paper with red ink or paint
• Express your feelings in a journal
• Compose a poem or song to say what you feel
• Write down any negative feelings and then rip the paper up
• Listen to music that expresses what you’re feeling

If you cut to calm and soothe yourself

• Take a bath or hot shower
• Pet or cuddle with a dog or cat
• Wrap yourself in a warm blanket
• Massage your neck, hands, and feet
• Listen to calming music

If you cut because you feel disconnected and numb

• Call a friend (you don’t have to talk about self-harm)
• Take a cold shower
• Hold an ice cube in the crook of your arm or leg
• Chew something with a very strong taste, like chili peppers, peppermint, or a grapefruit peel.
• Go online to a self-help website, chat room, or message board

If you cut to release tension or vent anger

• Exercise vigorously—run, dance, jump rope, or hit a punching bag
• Punch a cushion or mattress or scream into your pillow
• Squeeze a stress ball or squish Play-Doh or clay
• Rip something up (sheets of paper, a magazine)
• Make some noise (play an instrument, bang on pots and pans)