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The Rutherglen MP, who previously called for Dominic Cummings to resign over his Barnard Castle trip, has issued an apology for her actions on social media.
She said she had no excuse for her behaviour, and has now reported herself to the police.
In her statement, Ms Ferrier wrote: "I apologise unreservedly for breaching Covid-19 restrictions by travelling this week when I shouldn't have. There is no excuse for my actions.
"On Saturday afternoon, after experiencing mild symptoms, I requested a Covid-19 test which I took that day. Feeling much better, I then travelled to London by train on Monday to attend Parliament as planned. This was wrong, and I am very sorry for my mistake.
"On Monday evening I received a positive test result for Covid-19. I travelled home by train on Tuesday morning without seeking advice. This was also wrong and I am sorry. I have been self-isolating at home ever since.
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