Google is smart enough to crawl a website by its own but an XML sitemap would be a great help to find more pages in quick time. Better internal linking is also appreciated by Google when deciding on which page to crawl.
If your website contains some content pages and you would like them getting indexed by the Google search engine, by adding links to them from other sources, preferably frequently crawled web spots or blogs and at the same time use techniques like Google Webmaster Tools, creating an easy to access HTML sitemap page and also using XML solution, and also updating its pages regularly, your site will get crawled more by Google.
Outdated sites which are rarely updated might not even get accessed by Google once a week and it seems a logical cause because Google simply sees no reasons at all to check them out frequently. The more you add fresh contents to your website and build more links for that, the more pages would be having chances of getting accessed and indexed as well.
I think that you should consider creating and submitting a detailed Sitemap of your pages. Sitemaps are an easy way for you to submit all your URLs to the Google index and get detailed reports about the visibility of your pages on Google.
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You can also get your site indexed by using social bookmarks and backlinking your website. Even if you don't have a google webmaster account google will still crawl your site. The most important links are internal linking so google can crawl all of your pages.