Several ways are possible. In case you are in a company where Scrum is in use, request to be a Scrum Master or if not possible, get trained or mentored by one – observe as well. In case your company is not using Scrum, the best way to get hired as Scrum Master is get certified by either attending a Scrum Master course and clear the related exam or study online to pass the Professional Scrum Master I (PSM I).