You can change the country in Google Play Store by following these steps.

1. Go to Google Payments and sign in with your account.
   
2. Click on Settings in the top right corner.
   
3. Click Edit next to the home address and update the address.
4. Next, on your mobile device, open the PlayStore and try to buy any item. You don’t need to complete the purchase; just proceed until you reach the ‘Accept and Buy’ screen.
   
5. Next, close the Play Store and open the Settings app and go to Apps > All > Google Play Store. Then tap on the ‘Clear Data’ button.
   
6. Then, again, open the Playstore app. The country would have been updated.

Important: You can change your Google Play country or region only once per year. After setting or updating your country or region, you’ll need to wait 12 months before making another change. To switch to a new country or region, you must have a payment method from that location.

For any issues please refer to Google forum.