Looking for logging into the Salesforce Sandbox Password site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Salesforce Sandbox Password site. After that you can login as usual with your login credentials.
https://help.salesforce.com/htviewsolution?id=000175987
https://success.salesforce.com/answers?id=90630000000gq5BAAQ
https://developer.salesforce.com/forums/?id=906F0000000AuSrIAK
https://salesforce.stackexchange.com/questions/31543/how-to-login-into-a-sandbox-from-sandboxes-page-in-production-org
https://salesforce.stackexchange.com/questions/31543/how-to-login-into-a-sandbox-from-sandboxes-page-in-production-org?rq=1
https://stackoverflow.com/questions/2748855/how-to-log-into-a-salesforce-com-sandbox
https://force.desk.com/customer/en/portal/articles/2659738-find-the-username-and-password-for-your-trailhead-playground?b_id=13478
https://dreamevent.secure.force.com/articleView?id=data_sandbox_implementation_tips.htm&type=5
https://bluecanvas.io/2017/02/09/salesforce-sandbox-password-manager.html
https://www.bitium.com/salesforce-sandbox-login
https://www.pocketsoap.com/osx/maildrop/help/pages/login.html
https://altvia.com/are-you-not-getting-password-reset-emails-from-salesforce/
https://helpconsole.validity.com/PeopleImport/default.aspx?pageid=salesforce_oauth_login