Just responding only to open positions mentionning remote work or stating that you want remote only to the thousands of head hunters in linkedin is enough.
Are you referring to speciality or geographic area? For some specialities, if the specialty doesn't have remote work (say it's robotics or biotech or something else with a heavy lab component), you might be out of luck. If it's geographic, well, find headhunters in another geography.
Due to employment, tax and labor laws in my country, remote work still has to be done for a company that has a presence in my country. I can't have an employment contract with a company not based here, only B-2-B.
So remote basically limits me to local companies, which don't usually offer 100% remote work posibilities.