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Jannu SairamJannu Sairam 

How to log in to sandbox after sandbox refresh?

SubratSubrat (Salesforce Developers) 
Hello Jannu ,

When you refresh a sandbox, SSO settings are usually incorrect. After a refresh, you usually have to log in and fix those settings, and possibly fix the settings in Identity Connect as well. Fortunately, all is not lost. You can usually log in by appending ?login to your login URL. For example: https://mydomain.cs20.my.salesforce.com?login should allow you to log in, assuming that's your correct login URL. If that fails, you can contact support, and they can fix your Salesforce settings for you by disabling forced SSO logins.

Reference -> https://salesforce.stackexchange.com/questions/107258/cannot-login-into-sandbox-after-refresh

Hope this helps !
Thank you.
Naveen KNNaveen KN
after the refresh of sandbox, admins will reset the password for all the users.

You can contact your salesforce admin to reset password.