Random.onUnitSphere

public static Vector3 onUnitSphere ;

Description

Returns a random point on the surface of a sphere with radius 1.0 (Read Only).

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        // Sets the rigidbody velocity to 10 and in a random direction.

        GetComponent<Rigidbody>().velocity = Random.onUnitSphere * 10;
    }
}