That comes amid mounting evidence the coronavirus pandemic's economic damage is even worse than expected.
The Bank of Japan said it will buy an additional 15 trillion yen (USD 140 billion) of commercial paper and bank loans.
That is a significant increase from the timid 2 trillion yen in purchases announced in March, said Marcel Thieliant of Capital Economics in a report.
The bank also raised its ceiling on purchases of government debt.
Elsewhere, the US Federal Reserve is more likely to announce it will wait to see the impact of earlier stimulus before taking more action, Hayaki Narita of Mizuho Bank said in a report.
The European Central Bank will likely keep its options for easing open.
Also Monday, China's government reported profits at major industrial companies shrank 34.9 per cent in March over a year earlier.
That was an improvement over the 38.3 per cent decline in January and February, but analysts said a full recovery is a long way off.
This week's other potentially market-moving events include data from the United States, China, Japan, Germany and France on inflation, trade, industrial activity and retail spending.
The Shanghai Composite Index gained 0.7 per cent to 2,827.50 while the Nikkei 225 in Tokyo rose to 19,803.99.
The Hang Seng in Hong Kong added 1.8 per cent to 24,270.61.
In Seoul, the Kospi was 2.1 per cent higher at 1,928.23.
Sydney's S&P-ASX 200 gained 0.7 per cent to 5,278.30 and India's Sensex opened up 2 per cent at 31,970.09.
Singapore advanced 1.3 per cent and Bangkok was up 0.6 per cent.
Investors appear to be looking past the outbreak to figure out which companies can survive and prosper after conditions improve.
China, where the pandemic began in December, has reopened factories and other businesses after numbers of new cases declined.
Spain plans to start easing restrictions Sunday and Italy on May 4. France will announce its plans next month.
President Donald Trump, campaigning for re-election, is pressing state governors to ease anti-disease controls as early as possible.
Some governors are lifting shutdown orders despite warnings that could cause a surge in infections.
Others including Governor Andrew Cuomo of New York say they want a bigger decline in new cases before rolling back curbs.
The hope that peak virus is upon us has lifted financial markets modestly in Asia, said Jeffrey Halley of Oanda in a report.
The hopes that even a partial return to regular economic activity begins, to draw a line under the economic carnage wrought by the pandemic, should see markets such as equities outperform this week.
Wall Street ended last week higher after Trump signed legislation to provide an additional USD 500 billion in virus aid, including loans to small businesses.
US government data showed an unexpectedly sharp 14.4 per cent drop in durable goods orders.
That added to grim numbers that are denting investor sentiment, which economists have warned is far too optimistic.
The S&P 500 Index gained 1.4 per cent to 2,836.74.
The US benchmark is down 16.2 per cent from its February record.
The Dow Jones Industrial Average rose 1.1 per cent to 23,775.25.
The Nasdaq composite added 1.7 per cent to 8,634.52.
Investors have written off 2020 as a shocker and are looking more intently into the landscape in 2021, Chris Weston of Pepperstone said in a report.
They are due to get more indicators how that future might develop when companies including Exxon, Amazon, Microsoft, Boeing and McDonald's start reporting quarterly results this week.
In energy markets, benchmark US crude for June delivery lost USD 1.76 cents to USD 15.20 per barrel in electronic trading on the New York Mercantile Exchange.
The contract rose 2.7 per cent on Friday to settle at usd 16.94.
Brent crude, used to price international oils, declined 88 cents to USD 23.93 per barrel in London.
It added 0.5 per cent the previous session to USD 21.44 per barrel.
The dollar declined to 107.27 yen from Friday's 107.49 yen. The euro gained to USD 1.0847 from USD 1.0823.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)