Seems to me there was a post just like this in the past couple of days. Anyhow - I suggested staying at a nice campground just south of Depoe Bay (just south of Lincoln City) and there were other suggestions for Yurts, etc.

Here is one webpage that may help:

http://www.allstays.com/Campgrounds/or-depoe-bay-campgrounds.htm

Most of the campgrounds are operated either by the State Parks and Rec Dept. or the US Forest Service. Forest Service campgrounds are probably more what you're looking for, but they also are more rustic and have fewer services. State Parks campgrounds on the other hand are mostly "awning to awning" but have all the services you'd want. One of the few exceptions is Carl Washburne, where the campsites are "walk-in" only. Aren't many there though, so you'd definitely want to make a reservation. Couple others I like are Sunset Bay and Cape Lookout, which, because they're a ways off hwy 101, aren't as busy as many/most others.

These sites might be helpful:
http://www.oregonstateparks.org/searchpark.php
http://www.oregoncoasttravel.net/120/oregon_coast/Forest-Service-campgrounds.htm
Oregoncoasttravel.net is particularly useful as a mile-by-mile guide.

If you're planning this for summer, best make reservations. Now!!

this was also posted yesterday - with several responses

Our county parks are a great alternative.
Here are the websites for Lane and Lincoln counties.
http://ecomm.lanecounty.org/parks/
http://www.co.lincoln.or.us/lcparks/park_amenities.html

The Oregon dunes had nice campsites.

http://www.flickr.com/photos/mksfca/4229842219/in/set-72157622981132189