The Residential Landlords Association (RLA) is warning that scrapping Section 21 will cut rental supply.
The RLA said that a quarter of its members are contemplating selling at least one property in the next year.
This is the highest proportion of landlords planning an exit since the RLA first started asking this question regularly in 2016.
The same poll, of around 2,500 landlords, shows that 23% have seen an increase in demand for rental property over the previous three months, with 57% reporting it to be stable.
Despite the increased demand, more than a third of landlords reported low levels of confidence in the private rented sector over the next 12 months.
David Smith, policy director for the RLA, said: “All the talk of longer tenancies will mean nothing if the homes to rent are not there in the first place.
“The Government’s tax increases on the sector are already making it difficult for tenants to find a place to live, with many landlords not renewing tenancies.
“If rushed and not thought through, planned changes to the way landlords can repossess properties risk making the situation even worse.
“Action is needed to stimulate supply with pro-growth taxation and a process for repossessing homes that is fair to all.”
However, David Alexander, joint managing director of Edinburgh-based agent Apropos by DJ Alexander, pointed out that many of the incoming changes in England, such as the tenant fees ban and the scrapping of Section 21 notices, have already been introduced in Scotland.
Alexander said: “The no-fault grounds for eviction notices no longer apply in Scotland and the Scottish Government recently introduced much greater security of tenure for tenants.
“In many ways Scotland has led the way in improving the rights of tenants and changing the relationship between landlord and tenant.
“All of the changes which have already occurred in Scotland led to complaints from landlords and agents that it would mean the end of the lettings market.
“Yet the world has not collapsed, landlords and agents are still making money from property, and the best in the market adapt.”