Generally, yes. Foreign nationals who leave Canada may be able to re-enter Canada provided that they have a multi-entry visa allowing them to enter, or alternatively they are from a visa-exempt country.
However, if you are under implied status and exit and re-enter Canada before a decision is made on your application, while you may be allowed to enter the country, you will no longer have the legal standing to resume work until a decision is made with respect to your new application. For this reason, it is almost always advisable to remain in Canada while under implied status.
If you are under implied status and are considering leaving Canada, and want to understand your legal standing upon re-entry, please contact Toronto employment and immigration lawyers, Sultan Lawyers, at (416) 214-5111 or via email to mlahert@sultanlawyers.com.