Only 4% were satisfied with the way things were going in Sri Lanka, down from 7% in October but higher than 2% in June.
The Paris Club of creditors, which includes Japan, earlier this year gave financing assurances to support the IMF deal.
A Japan-funded $1.8 billion light-railway project, which was suspended in 2019, is among infrastructure projects that Sri Lanka is now trying to restart.
But Sri Lanka still needs to renegotiate its debt, a potentially drawn-out process where Wickremesinghe, who is also the finance minister, will have to deal with demands from China, India and other creditors.
A crisis-weary public may still have to absorb years of continuing hardship as Sri Lanka tries to fix its economy during the four-year IMF programme, warned Jayadeva Uyangoda, a senior political analyst.