Does a sponsor need to report a change in workplace if a Tier 2 visa holder is working from home as a result of Covid-19?

No. The Home Office has confirmed that sponsors do not need to report sponsored workers as working from home, where this is directly related to the coronavirus outbreak.

However any UK employers who sponsor overseas workers, should also ensure that they remain compliant with their other sponsor licence duties, which includes reporting any change to an employee’s salary and duties.