Yes, but only students from the following countries can enter Canada with just a passport and signed I-20 from a Designed School Officer (DSO). Other students from not listed below on the following countries must obtain Electronic System for Travel Authorization (ESTA) but be registered aminimum of 3 days before traveling.

citizens of Andorra, Antigua and Barbuda, Australia, Austria, Bahamas, Barbados, Belgium, Botswana, Brunei, Croatia, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Israel (National Passport holders only), Italy, Japan, Korea (Republic of), Latvia (Republic of), Lithuania, Liechtenstein, Luxembourg, Malta, Monaco, Namibia, Netherlands, New Zealand, Norway, Papua New Guinea, Poland, Portugal, St. Kitts and Nevis, St. Lucia, St. Vincent, San Marino, Singapore, Slovakia, Solomon Islands, Spain, Swaziland, Sweden, Slovenia, Switzerland, United States, and Western Samoa