Changing controls in a 2d game?

Question

C++ / C#

character control script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerControler : MonoBehaviour
{
    Rigidbody2D rb;

    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space) && isGround)
        {
            rb.AddForce(transform.up * 10f, ForceMode2D.Impulse);
        }
    }

    void FixedUpdate()
    {
        rb.velocity = new Vector2(Input.GetAxis("Horizontal") * 6f, rb.velocity.y);
    }
}

Is it possible to somehow change the control to other keys, from another script? And how can this be done?