Tang Hua Seng: Two locations, one in Banglamphoo ( 172-182, Chakkraphong Rd, Talat Yot, Phra Nakhon, Bangkok, 10200 ) near Khao San Road and one on 289 Sirithorn Road in Thon Buri. If going to the Thon Buri shop, take a taxi and the driver is very likely to know how to get there.
At the Khao San location, the craft supplies are on the first floor, while at the larger Sirithorn Road location, they are on the 3rd floor. Full selection of just about everything!
Sampeng Alley: This is not a shop, but several narrow alleys of wholesale shops selling everything from fabrics, buttons, scissors to yarn, needles and other craft supplies. You’ll find mostly acrylic yarn here at the handful of shops that carry knitting supplies.
For a great map of Sampeng, look here
Big Knit Cafe: 88 The Natural Park Bldg. next to Dental Hostital, Sukhumvit 49 (www.bigknit49.com)
Western style LYS and cafe. Lots of fancy yarns and comfy couches.
Zawa Knitting: 49 Sukhumvit 49 Khwang Khlongton Nuea Khet Watthana
This is almost across the street from Big Knit Cafe. I have never been here, but hear that it is nice.
Owl Crafts:, (owlcraftshop.com) 3rd floor, 1179/9 Thanon Manorom, Rama IV Road, Klongton, Khlongtoei, Bangkok. Th. Manoram is just past the Tesco Lotus on Rama IV Road.
Haven’t been here but it looks nice.