The Iceland international broke the deadlock in Saturday's London derby as Spurs bossed the first half at White Hart Lane, before Chelsea hit back after the interval and equalised thanks to a John Terry header.
While he was pleased to continue his own fine form, Sigurdsson bemoaned Tottenham's failure to get a second goal when they were in control.
"It's nice to get another goal, especially against Chelsea at home, but I would have preferred the three points," Sigurdsson told his club's official website.
"We played well in the first half, created a lot of chances, got the goal but in the second half, Chelsea were on top until Torres was sent off.
"We then dominated the last 10 minutes but they defended well and we couldn't get past them.
"We were on top in the first half and continued what we've been doing in the last few games. We've a lot of confidence and I think if we'd have scored the second goal it would have killed the game.
"Now we look to the next game."
The next challenge for Tottenham is an away game against Russia's Anzhi Makhachkala in the Europa League on Thursday.