No, Sophos doesn’t offer a free plan. However, you can try it for free for 30 days, and there’s also a 30-day money-back guarantee.
There are some free antivirus options on the market that can offer you some basic protections. However it’s always better to spend a few bucks on premium antivirus protection if you can. Sophos Home Premium is a decent choice, and very affordable compared to its competitors.