Yes, in general a Jain may practice wrestling, as long as it aligns with ahimsa (non-violence) and the broader Jain emphasis on harmlessness and self-control.

Key points:

• The core Jain principle is non-violence toward all living beings. If wrestling is pursued without causing unnecessary harm, cruelty, or exploitation, it can be acceptable.
• For monks and nuns (monastics), the vows of ahimsa and non-violence are stricter, so physical combat or aggressive violence would be inappropriate. Lay followers may participate in wrestling as a sport or fitness activity, provided it is practiced safely and without injury or cruelty to others.
• Emphasis is on self-discipline, avoiding harm, and not glorifying violence. If the activity involves coercion, cheating, or causing harm to opponents or animals used in training, it would conflict with Jain principles.

If you’d like, I can share a concise Jain exposition on ahimsa and physical activities, or point you to a Jain source that discusses the broader ethics of sports and violence.