c# - How do I make my character jump in every direction?

My character can only jump when he is grounded, but he can only grounded in one direction I want him to jump in every direction, can anyone help?

CAN JUMP :

CAN'T JUMP :

Code:

 using UnityEngine;
using System.Collections;

public class Player: MonoBehaviour {

public float maxspeed = 10f;

bool facingRight = true;

Animator anim;

bool grounded = false;
public Transform groundCheck;
float groundRadius = 0.2f;
public LayerMask whatIsGround;
public Vector2 jumpDirection = new Vector2(0f, 0f);
public float jumpFocre = 500f;


bool doubleJump = false;

void Start ()
{
    anim = GetComponent ();
}

void FixedUpdate () {
    grounded = Physics2D.OverlapCircle(groundCheck.position, groundRadius, whatIsGround);

    anim.SetBool ("Ground", grounded);

    if (grounded)
        doubleJump = false;

    float move = Input.GetAxis ("Horizontal");
    anim.SetFloat ("Speed", Mathf.Abs (move));

    GetComponent().velocity = new Vector2(move * maxspeed, GetComponent().velocity.y);
}

void Update()
{
    if((!doubleJump) && Input.GetKeyDown ("up"))
    {
        anim.SetBool("Ground", false);
        float move = Input.GetAxis ("Horizontal");
        jumpDirection.x = move;
        GetComponent().AddForce(jumpDirection.normalized * jumpFocre);

        if(!doubleJump && !grounded)

            doubleJump = true;
    }


}

void Flip()
{
    facingRight = !facingRight;
    Vector3 theScale = transform.localScale;

    theScale.x *= -1;
    transform.localScale = theScale;    
}
}