Scots, which joins the Dutch in the last four, achieved the 100-run target in 17.4 overs after Ryan Watson had won the toss and put Bermuda into bat in Belfast.
Bermuda never looked comfortable against a rejuvenated Scots bowling attack led by former Worcestershire fast bowler Dewald Nel, who finished with impressive figures of 3/12 in his quota of four overs that included two maidens, was rightly adjudged as man-of-the-match.
Stephen Outerbridge with an unbeaten run-a-ball 37 was the top scorer for Bermuda while David Hemp and Oliver Pitcher scored 20 and 13 respectively.
In reply Scotland got off to a nervous start losing Watson (0) and Fraser Watts (7) cheaply but an unbroken 92-run third wicket partnership between Smith and Poonia ensured that the third-seeded side not only won without any further hiccups but also managed to finish with a positive net run-rate.
The 35-year-old Smith scored 46 from 42 balls with four fours while Poonia scored 38 from 54 deliveries.
At stake in the Belfast tournament are two or possibly three places in the World T20 2009 being staged in England. Both finalists will qualify for the tournament which will take place at Lord"s, The Oval and Trent Bridge next June.
The third place to be decided by a third and fourth-place play-off will qualify to the main event at the expense of Zimbabwe who pulled out of the T20 World after the hosts England imposed sanctions on the Mugabe-ruled East African nation.
Bermuda 99/7 in 20 overs (Outerbridge 37 n o, David Hemp 20; Dewald Nel 3/12) lost to Scotland 100/2 in 17.4 overs (Colin Smith 46 n o, Navdeep Poonia 38 n o).