If a company outlines that they will not provide sponsorship in the job posting, then you should not apply.  To see whether a company will provide sponsorship for a job, view the job posting and check the details box to the right of the job description.  You will see “Will Sponsor Visa: Yes/No.”
We recommend contacting the recruiter or employer directly with any questions about sponsorship.  They will also let you know about opportunities on our site which allow you to apply without a Visa or sponsorship.